float AddSoilFog(float3 Pos)
		{
			float value;
			float low;
			float high;
			float3 P = mul( Pos, matWorld );
			high = 1 - ( distance( P, vecViewPos ) - vecFog.x ) * vecFog.z;
			low = ( P.y / 30 );	// min. low fog
			value = lerp( high, low, 0.2); // mixing high and low fog
			return value;
		}
 

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Thanks! Looks very useful! Don't remember that I've ever seen this in a game!

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